001package org.cpsolver.studentsct;
002
003import java.io.File;
004import java.util.ArrayList;
005import java.util.BitSet;
006import java.util.HashSet;
007import java.util.HashMap;
008import java.util.Iterator;
009import java.util.List;
010import java.util.Map;
011import java.util.Set;
012
013import org.cpsolver.coursett.model.Placement;
014import org.cpsolver.coursett.model.RoomLocation;
015import org.cpsolver.coursett.model.TimeLocation;
016import org.cpsolver.ifs.assignment.Assignment;
017import org.cpsolver.ifs.model.Constraint;
018import org.cpsolver.ifs.util.DistanceMetric;
019import org.cpsolver.ifs.util.Progress;
020import org.cpsolver.studentsct.filter.StudentFilter;
021import org.cpsolver.studentsct.model.AcademicAreaCode;
022import org.cpsolver.studentsct.model.Choice;
023import org.cpsolver.studentsct.model.Config;
024import org.cpsolver.studentsct.model.Course;
025import org.cpsolver.studentsct.model.CourseRequest;
026import org.cpsolver.studentsct.model.Enrollment;
027import org.cpsolver.studentsct.model.FreeTimeRequest;
028import org.cpsolver.studentsct.model.Offering;
029import org.cpsolver.studentsct.model.Request;
030import org.cpsolver.studentsct.model.RequestGroup;
031import org.cpsolver.studentsct.model.Section;
032import org.cpsolver.studentsct.model.Student;
033import org.cpsolver.studentsct.model.Subpart;
034import org.cpsolver.studentsct.reservation.CourseReservation;
035import org.cpsolver.studentsct.reservation.CurriculumReservation;
036import org.cpsolver.studentsct.reservation.DummyReservation;
037import org.cpsolver.studentsct.reservation.GroupReservation;
038import org.cpsolver.studentsct.reservation.IndividualReservation;
039import org.cpsolver.studentsct.reservation.Reservation;
040import org.cpsolver.studentsct.reservation.ReservationOverride;
041import org.dom4j.Document;
042import org.dom4j.DocumentException;
043import org.dom4j.Element;
044import org.dom4j.io.SAXReader;
045
046/**
047 * Load student sectioning model from an XML file.
048 * 
049 * <br>
050 * <br>
051 * Parameters:
052 * <table border='1' summary='Related Solver Parameters'>
053 * <tr>
054 * <th>Parameter</th>
055 * <th>Type</th>
056 * <th>Comment</th>
057 * </tr>
058 * <tr>
059 * <td>General.Input</td>
060 * <td>{@link String}</td>
061 * <td>Path of an XML file to be loaded</td>
062 * </tr>
063 * <tr>
064 * <td>Xml.LoadBest</td>
065 * <td>{@link Boolean}</td>
066 * <td>If true, load best assignments</td>
067 * </tr>
068 * <tr>
069 * <td>Xml.LoadInitial</td>
070 * <td>{@link Boolean}</td>
071 * <td>If false, load initial assignments</td>
072 * </tr>
073 * <tr>
074 * <td>Xml.LoadCurrent</td>
075 * <td>{@link Boolean}</td>
076 * <td>If true, load current assignments</td>
077 * </tr>
078 * <tr>
079 * <td>Xml.LoadOfferings</td>
080 * <td>{@link Boolean}</td>
081 * <td>If true, load offerings (and their stucture, i.e., courses,
082 * configurations, subparts and sections)</td>
083 * </tr>
084 * <tr>
085 * <td>Xml.LoadStudents</td>
086 * <td>{@link Boolean}</td>
087 * <td>If true, load students (and their requests)</td>
088 * </tr>
089 * <tr>
090 * <td>Xml.StudentFilter</td>
091 * <td>{@link StudentFilter}</td>
092 * <td>If provided, students are filtered by the given student filter</td>
093 * </tr>
094 * </table>
095 * 
096 * <br>
097 * <br>
098 * Usage:
099 * <pre><code>
100 * StudentSectioningModel model = new StudentSectioningModel(cfg);<br>
101 * new StudentSectioningXMLLoader(model).load();<br>
102 * </code></pre>
103 * 
104 * @version StudentSct 1.3 (Student Sectioning)<br>
105 *          Copyright (C) 2007 - 2014 Tomas Muller<br>
106 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
107 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
108 * <br>
109 *          This library is free software; you can redistribute it and/or modify
110 *          it under the terms of the GNU Lesser General Public License as
111 *          published by the Free Software Foundation; either version 3 of the
112 *          License, or (at your option) any later version. <br>
113 * <br>
114 *          This library is distributed in the hope that it will be useful, but
115 *          WITHOUT ANY WARRANTY; without even the implied warranty of
116 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
117 *          Lesser General Public License for more details. <br>
118 * <br>
119 *          You should have received a copy of the GNU Lesser General Public
120 *          License along with this library; if not see
121 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
122 */
123
124public class StudentSectioningXMLLoader extends StudentSectioningLoader {
125    private static org.apache.log4j.Logger sLogger = org.apache.log4j.Logger
126            .getLogger(StudentSectioningXMLLoader.class);
127
128    private File iInputFile;
129    private File iTimetableFile = null;
130    private boolean iLoadBest = false;
131    private boolean iLoadInitial = false;
132    private boolean iLoadCurrent = false;
133    private boolean iLoadOfferings = true;
134    private boolean iLoadStudents = true;
135    private StudentFilter iStudentFilter = null;
136
137    /**
138     * Constructor
139     * 
140     * @param model
141     *            student sectioning model
142     * @param assignment current assignment
143     */
144    public StudentSectioningXMLLoader(StudentSectioningModel model, Assignment<Request, Enrollment> assignment) {
145        super(model, assignment);
146        iInputFile = new File(getModel().getProperties().getProperty("General.Input",
147                "." + File.separator + "solution.xml"));
148        if (getModel().getProperties().getProperty("General.InputTimetable") != null)
149            iTimetableFile = new File(getModel().getProperties().getProperty("General.InputTimetable"));
150        iLoadBest = getModel().getProperties().getPropertyBoolean("Xml.LoadBest", true);
151        iLoadInitial = getModel().getProperties().getPropertyBoolean("Xml.LoadInitial", true);
152        iLoadCurrent = getModel().getProperties().getPropertyBoolean("Xml.LoadCurrent", true);
153        iLoadOfferings = getModel().getProperties().getPropertyBoolean("Xml.LoadOfferings", true);
154        iLoadStudents = getModel().getProperties().getPropertyBoolean("Xml.LoadStudents", true);
155        if (getModel().getProperties().getProperty("Xml.StudentFilter") != null) {
156            try {
157                iStudentFilter = (StudentFilter) Class.forName(
158                        getModel().getProperties().getProperty("Xml.StudentFilter")).getConstructor(new Class[] {})
159                        .newInstance(new Object[] {});
160            } catch (Exception e) {
161                sLogger.error("Unable to create student filter, reason: " + e.getMessage(), e);
162            }
163        }
164    }
165
166    /** Set input file (e.g., if it is not set by General.Input property) 
167     * @param inputFile input file
168     **/
169    public void setInputFile(File inputFile) {
170        iInputFile = inputFile;
171    }
172
173    /** Set student filter 
174     * @param filter student filter 
175     **/
176    public void setStudentFilter(StudentFilter filter) {
177        iStudentFilter = filter;
178    }
179
180    /** Set whether to load students 
181     * @param loadStudents true if students are to be loaded
182     **/
183    public void setLoadStudents(boolean loadStudents) {
184        iLoadStudents = loadStudents;
185    }
186
187    /** Set whether to load offerings 
188     * @param loadOfferings true if instructional offerings are to be loaded
189     **/
190    public void setLoadOfferings(boolean loadOfferings) {
191        iLoadOfferings = loadOfferings;
192    }
193
194    /** Create BitSet from a bit string */
195    private static BitSet createBitSet(String bitString) {
196        BitSet ret = new BitSet(bitString.length());
197        for (int i = 0; i < bitString.length(); i++)
198            if (bitString.charAt(i) == '1')
199                ret.set(i);
200        return ret;
201    }
202
203    /** Load the file */
204    @Override
205    public void load() throws Exception {
206        sLogger.debug("Reading XML data from " + iInputFile);
207
208        Document document = (new SAXReader()).read(iInputFile);
209        Element root = document.getRootElement();
210
211        load(root);
212    }
213    
214    /**
215     * Load data from the given XML root
216     * @param root document root
217     * @throws DocumentException
218     */
219    protected void load(Element root) throws DocumentException {
220        sLogger.debug("Root element: " + root.getName());
221        if (!"sectioning".equals(root.getName())) {
222            sLogger.error("Given XML file is not student sectioning problem.");
223            return;
224        }
225        
226        if (iLoadOfferings && getModel().getDistanceConflict() != null && root.element("travel-times") != null)
227            loadTravelTimes(root.element("travel-times"), getModel().getDistanceConflict().getDistanceMetric());
228        
229        Map<Long, Placement> timetable = null;
230        if (iTimetableFile != null) {
231            sLogger.info("Reading timetable from " + iTimetableFile + " ...");
232            Document timetableDocument = (new SAXReader()).read(iTimetableFile);
233            Element timetableRoot = timetableDocument.getRootElement();
234            if (!"timetable".equals(timetableRoot.getName())) {
235                sLogger.error("Given XML file is not course timetabling problem.");
236                return;
237            }
238            timetable = loadTimetable(timetableRoot);
239        }
240
241        Progress.getInstance(getModel()).load(root, true);
242        Progress.getInstance(getModel()).message(Progress.MSGLEVEL_STAGE, "Restoring from backup ...");
243
244        if (root.attributeValue("term") != null)
245            getModel().getProperties().setProperty("Data.Term", root.attributeValue("term"));
246        if (root.attributeValue("year") != null)
247            getModel().getProperties().setProperty("Data.Year", root.attributeValue("year"));
248        if (root.attributeValue("initiative") != null)
249            getModel().getProperties().setProperty("Data.Initiative", root.attributeValue("initiative"));
250
251        Map<Long, Offering> offeringTable = new HashMap<Long, Offering>();
252        Map<Long, Course> courseTable = new HashMap<Long, Course>();
253
254        if (iLoadOfferings && root.element("offerings") != null) {
255            loadOfferings(root.element("offerings"), offeringTable, courseTable, timetable);
256        } else {
257            for (Offering offering : getModel().getOfferings()) {
258                offeringTable.put(new Long(offering.getId()), offering);
259                for (Course course : offering.getCourses()) {
260                    courseTable.put(new Long(course.getId()), course);
261                }
262            }
263        }
264
265        if (iLoadStudents && root.element("students") != null) {
266            loadStudents(root.element("students"), offeringTable, courseTable);
267        }
268        
269        if (iLoadOfferings && root.element("constraints") != null) 
270            loadLinkedSectiond(root.element("constraints"), offeringTable);
271        
272        sLogger.debug("Model successfully loaded.");
273    }
274    
275    /**
276     * Load offerings
277     * @param offeringsEl offerings element
278     * @param offeringTable offering table
279     * @param courseTable course table
280     * @param timetable provided timetable (null if to be loaded from the given document)
281     */
282    protected void loadOfferings(Element offeringsEl, Map<Long, Offering> offeringTable, Map<Long, Course> courseTable, Map<Long, Placement> timetable) {
283        HashMap<Long, Config> configTable = new HashMap<Long, Config>();
284        HashMap<Long, Subpart> subpartTable = new HashMap<Long, Subpart>();
285        HashMap<Long, Section> sectionTable = new HashMap<Long, Section>();
286        for (Iterator<?> i = offeringsEl.elementIterator("offering"); i.hasNext();) {
287            Element offeringEl = (Element) i.next();
288            Offering offering = new Offering(
289                    Long.parseLong(offeringEl.attributeValue("id")),
290                    offeringEl.attributeValue("name", "O" + offeringEl.attributeValue("id")));
291            offeringTable.put(new Long(offering.getId()), offering);
292            getModel().addOffering(offering);
293            
294            for (Iterator<?> j = offeringEl.elementIterator("course"); j.hasNext();) {
295                Element courseEl = (Element) j.next();
296                Course course = loadCourse(courseEl, offering);
297                courseTable.put(new Long(course.getId()), course);
298            }
299            
300            for (Iterator<?> j = offeringEl.elementIterator("config"); j.hasNext();) {
301                Element configEl = (Element) j.next();
302                Config config = loadConfig(configEl, offering, subpartTable, sectionTable, timetable);
303                configTable.put(config.getId(), config);
304            }
305            
306            for (Iterator<?> j = offeringEl.elementIterator("reservation"); j.hasNext(); ) {
307                Element reservationEl = (Element)j.next();
308                loadReservation(reservationEl, offering, configTable, sectionTable);
309            } 
310        }
311    }
312    
313    /**
314     * Load course
315     * @param courseEl course element
316     * @param offering parent offering
317     * @return loaded course
318     */
319    protected Course loadCourse(Element courseEl, Offering offering) {
320        Course course = new Course(
321                Long.parseLong(courseEl.attributeValue("id")),
322                courseEl.attributeValue("subjectArea", ""),
323                courseEl.attributeValue("courseNbr", "C" + courseEl.attributeValue("id")),
324                offering, Integer.parseInt(courseEl.attributeValue("limit", "-1")),
325                Integer.parseInt(courseEl.attributeValue("projected", "0")));
326        return course;
327    }
328    
329    /**
330     * Load config
331     * @param configEl config element
332     * @param offering parent offering
333     * @param subpartTable subpart table (of the offering)
334     * @param sectionTable section table (of the offering)
335     * @param timetable provided timetable
336     * @return loaded config
337     */
338    protected Config loadConfig(Element configEl, Offering offering, Map<Long, Subpart> subpartTable, Map<Long, Section> sectionTable, Map<Long, Placement> timetable) {
339        Config config = new Config
340                (Long.parseLong(configEl.attributeValue("id")),
341                Integer.parseInt(configEl.attributeValue("limit", "-1")),
342                configEl.attributeValue("name", "G" + configEl.attributeValue("id")),
343                offering);
344        for (Iterator<?> k = configEl.elementIterator("subpart"); k.hasNext();) {
345            Element subpartEl = (Element) k.next();
346            Subpart subpart = loadSubpart(subpartEl, config, subpartTable, sectionTable, timetable);
347            subpartTable.put(new Long(subpart.getId()), subpart);
348        }
349        return config;
350    }
351    
352    /**
353     * Load subpart
354     * @param subpartEl supart element
355     * @param config parent config
356     * @param subpartTable subpart table (of the offering)
357     * @param sectionTable section table (of the offering)
358     * @param timetable provided timetable
359     * @return loaded subpart
360     */
361    protected Subpart loadSubpart(Element subpartEl, Config config, Map<Long, Subpart> subpartTable, Map<Long, Section> sectionTable, Map<Long, Placement> timetable) {
362        Subpart parentSubpart = null;
363        if (subpartEl.attributeValue("parent") != null)
364            parentSubpart = subpartTable.get(Long.valueOf(subpartEl.attributeValue("parent")));
365        Subpart subpart = new Subpart(
366                Long.parseLong(subpartEl.attributeValue("id")),
367                subpartEl.attributeValue("itype"),
368                subpartEl.attributeValue("name", "P" + subpartEl.attributeValue("id")),
369                config,
370                parentSubpart);
371        subpart.setAllowOverlap("true".equals(subpartEl.attributeValue("allowOverlap", "false")));
372        
373        
374        for (Iterator<?> l = subpartEl.elementIterator("section"); l.hasNext();) {
375            Element sectionEl = (Element) l.next();
376            Section section = loadSection(sectionEl, subpart, sectionTable, timetable);
377            sectionTable.put(new Long(section.getId()), section);
378        }
379        
380        return subpart;
381    }
382    
383    /**
384     * Load section
385     * @param sectionEl section element
386     * @param subpart parent subpart
387     * @param sectionTable section table (of the offering)
388     * @param timetable provided timetable
389     * @return loaded section
390     */
391    protected Section loadSection(Element sectionEl, Subpart subpart, Map<Long, Section> sectionTable, Map<Long, Placement> timetable) {
392        Section parentSection = null;
393        if (sectionEl.attributeValue("parent") != null)
394            parentSection = sectionTable.get(Long.valueOf(sectionEl.attributeValue("parent")));
395        Placement placement = null;
396        if (timetable != null) {
397            placement = timetable.get(Long.parseLong(sectionEl.attributeValue("id")));
398        } else {
399            TimeLocation time = null;
400            Element timeEl = sectionEl.element("time");
401            if (timeEl != null) {
402                time = new TimeLocation(
403                        Integer.parseInt(timeEl.attributeValue("days"), 2),
404                        Integer.parseInt(timeEl.attributeValue("start")),
405                        Integer.parseInt(timeEl.attributeValue("length")), 0, 0,
406                        timeEl.attributeValue("datePattern") == null ? null : Long.valueOf(timeEl.attributeValue("datePattern")),
407                        timeEl.attributeValue("datePatternName", ""),
408                        createBitSet(timeEl.attributeValue("dates")),
409                        Integer.parseInt(timeEl.attributeValue("breakTime", "0")));
410                if (timeEl.attributeValue("pattern") != null)
411                    time.setTimePatternId(Long.valueOf(timeEl.attributeValue("pattern")));
412            }
413            List<RoomLocation> rooms = new ArrayList<RoomLocation>();
414            for (Iterator<?> m = sectionEl.elementIterator("room"); m.hasNext();) {
415                Element roomEl = (Element) m.next();
416                Double posX = null, posY = null;
417                if (roomEl.attributeValue("location") != null) {
418                    String loc = roomEl.attributeValue("location");
419                    posX = Double.valueOf(loc.substring(0, loc.indexOf(',')));
420                    posY = Double.valueOf(loc.substring(loc.indexOf(',') + 1));
421                }
422                RoomLocation room = new RoomLocation(
423                        Long.valueOf(roomEl.attributeValue("id")),
424                        roomEl.attributeValue("name", "R" + roomEl.attributeValue("id")),
425                        roomEl.attributeValue("building") == null ? null : Long.valueOf(roomEl.attributeValue("building")),
426                        0, Integer.parseInt(roomEl.attributeValue("capacity")),
427                        posX, posY, "true".equals(roomEl.attributeValue("ignoreTooFar")), null);
428                rooms.add(room);
429            }
430            placement = (time == null ? null : new Placement(null, time, rooms));
431        }
432        
433        Section section = new Section(
434                Long.parseLong(sectionEl.attributeValue("id")),
435                Integer.parseInt(sectionEl.attributeValue("limit")),
436                sectionEl.attributeValue("name", "S" + sectionEl.attributeValue("id")),
437                subpart, placement, sectionEl.attributeValue("instructorIds"),
438                sectionEl.attributeValue("instructorNames"), parentSection);
439        
440        section.setSpaceHeld(Double.parseDouble(sectionEl.attributeValue("hold", "0.0")));
441        section.setSpaceExpected(Double.parseDouble(sectionEl.attributeValue("expect", "0.0")));
442        for (Iterator<?> m = sectionEl.elementIterator("cname"); m.hasNext(); ) {
443            Element cNameEl = (Element)m.next();
444            section.setName(Long.parseLong(cNameEl.attributeValue("id")), cNameEl.getText());
445        }
446        Element ignoreEl = sectionEl.element("no-conflicts");
447        if (ignoreEl != null) {
448            for (Iterator<?> m = ignoreEl.elementIterator("section"); m.hasNext(); )
449                section.addIgnoreConflictWith(Long.parseLong(((Element)m.next()).attributeValue("id")));
450        }
451        
452        return section;
453    }
454    
455    /**
456     * Load reservation
457     * @param reservationEl reservation element
458     * @param offering parent offering
459     * @param configTable config table (of the offering)
460     * @param sectionTable section table (of the offering)
461     * @return loaded reservation
462     */
463    protected Reservation loadReservation(Element reservationEl, Offering offering, HashMap<Long, Config> configTable, HashMap<Long, Section> sectionTable) {
464        Reservation r = null;
465        if ("individual".equals(reservationEl.attributeValue("type"))) {
466            Set<Long> studentIds = new HashSet<Long>();
467            for (Iterator<?> k = reservationEl.elementIterator("student"); k.hasNext(); ) {
468                Element studentEl = (Element)k.next();
469                studentIds.add(Long.parseLong(studentEl.attributeValue("id")));
470            }
471            r = new IndividualReservation(Long.valueOf(reservationEl.attributeValue("id")), offering, studentIds);
472        } else if ("group".equals(reservationEl.attributeValue("type"))) {
473            Set<Long> studentIds = new HashSet<Long>();
474            for (Iterator<?> k = reservationEl.elementIterator("student"); k.hasNext(); ) {
475                Element studentEl = (Element)k.next();
476                studentIds.add(Long.parseLong(studentEl.attributeValue("id")));
477            }
478            r = new GroupReservation(Long.valueOf(reservationEl.attributeValue("id")),
479                    Double.parseDouble(reservationEl.attributeValue("limit", "-1")),
480                    offering, studentIds);
481        } else if ("curriculum".equals(reservationEl.attributeValue("type"))) {
482            List<String> classifications = new ArrayList<String>();
483            for (Iterator<?> k = reservationEl.elementIterator("classification"); k.hasNext(); ) {
484                Element clasfEl = (Element)k.next();
485                classifications.add(clasfEl.attributeValue("code"));
486            }
487            List<String> majors = new ArrayList<String>();
488            for (Iterator<?> k = reservationEl.elementIterator("major"); k.hasNext(); ) {
489                Element majorEl = (Element)k.next();
490                majors.add(majorEl.attributeValue("code"));
491            }
492            r = new CurriculumReservation(Long.valueOf(reservationEl.attributeValue("id")),
493                    Double.parseDouble(reservationEl.attributeValue("limit", "-1")),
494                    offering,
495                    reservationEl.attributeValue("area"),
496                    classifications, majors);
497        } else if ("course".equals(reservationEl.attributeValue("type"))) {
498            long courseId = Long.parseLong(reservationEl.attributeValue("course"));
499            for (Course course: offering.getCourses()) {
500                if (course.getId() == courseId)
501                    r = new CourseReservation(Long.valueOf(reservationEl.attributeValue("id")), course);
502            }
503        } else if ("dummy".equals(reservationEl.attributeValue("type"))) {
504            r = new DummyReservation(offering);
505        } else if ("override".equals(reservationEl.attributeValue("type"))) {
506            Set<Long> studentIds = new HashSet<Long>();
507            for (Iterator<?> k = reservationEl.elementIterator("student"); k.hasNext(); ) {
508                Element studentEl = (Element)k.next();
509                studentIds.add(Long.parseLong(studentEl.attributeValue("id")));
510            }
511            r = new ReservationOverride(Long.valueOf(reservationEl.attributeValue("id")), offering, studentIds);
512        }
513        if (r == null) {
514            sLogger.error("Unknown reservation type "+ reservationEl.attributeValue("type"));
515            return null;
516        }
517        r.setExpired("true".equals(reservationEl.attributeValue("expired", "false")));
518        for (Iterator<?> k = reservationEl.elementIterator("config"); k.hasNext(); ) {
519            Element configEl = (Element)k.next();
520            r.addConfig(configTable.get(Long.parseLong(configEl.attributeValue("id"))));
521        }
522        for (Iterator<?> k = reservationEl.elementIterator("section"); k.hasNext(); ) {
523            Element sectionEl = (Element)k.next();
524            r.addSection(sectionTable.get(Long.parseLong(sectionEl.attributeValue("id"))));
525        }
526        r.setPriority(Integer.parseInt(reservationEl.attributeValue("priority", String.valueOf(r.getPriority()))));
527        r.setMustBeUsed("true".equals(reservationEl.attributeValue("mustBeUsed", r.mustBeUsed() ? "true" : "false")));
528        r.setAllowOverlap("true".equals(reservationEl.attributeValue("allowOverlap", r.isAllowOverlap() ? "true" : "false")));
529        r.setCanAssignOverLimit("true".equals(reservationEl.attributeValue("canAssignOverLimit", r.canAssignOverLimit() ? "true" : "false")));
530        return r;
531    }
532    
533    /**
534     * Load given timetable
535     * @param timetableRoot document root in the course timetabling XML format
536     * @return loaded timetable (map class id: assigned placement)
537     */
538    protected Map<Long, Placement> loadTimetable(Element timetableRoot) {
539        Map<Long, Placement> timetable = new HashMap<Long, Placement>();
540        HashMap<Long, RoomLocation> rooms = new HashMap<Long, RoomLocation>();
541        for (Iterator<?> i = timetableRoot.element("rooms").elementIterator("room"); i.hasNext();) {
542            Element roomEl = (Element)i.next();
543            Long roomId = Long.valueOf(roomEl.attributeValue("id"));
544            Double posX = null, posY = null;
545            if (roomEl.attributeValue("location") != null) {
546                String loc = roomEl.attributeValue("location");
547                posX = Double.valueOf(loc.substring(0, loc.indexOf(',')));
548                posY = Double.valueOf(loc.substring(loc.indexOf(',') + 1));
549            }
550            RoomLocation room = new RoomLocation(
551                    Long.valueOf(roomEl.attributeValue("id")),
552                    roomEl.attributeValue("name", "R" + roomEl.attributeValue("id")),
553                    roomEl.attributeValue("building") == null ? null : Long.valueOf(roomEl.attributeValue("building")),
554                    0, Integer.parseInt(roomEl.attributeValue("capacity")),
555                    posX, posY, "true".equals(roomEl.attributeValue("ignoreTooFar")), null);
556            rooms.put(roomId, room);
557        }
558        for (Iterator<?> i = timetableRoot.element("classes").elementIterator("class"); i.hasNext();) {
559            Element classEl = (Element)i.next();
560            Long classId = Long.valueOf(classEl.attributeValue("id"));
561            TimeLocation time = null;
562            Element timeEl = null;
563            for (Iterator<?> j = classEl.elementIterator("time"); j.hasNext(); ) {
564                Element e = (Element)j.next();
565                if ("true".equals(e.attributeValue("solution", "false"))) { timeEl = e; break; }
566            }
567            if (timeEl != null) {
568                time = new TimeLocation(
569                        Integer.parseInt(timeEl.attributeValue("days"), 2),
570                        Integer.parseInt(timeEl.attributeValue("start")),
571                        Integer.parseInt(timeEl.attributeValue("length")), 0, 0,
572                        classEl.attributeValue("datePattern") == null ? null : Long.valueOf(classEl.attributeValue("datePattern")),
573                        classEl.attributeValue("datePatternName", ""), createBitSet(classEl.attributeValue("dates")),
574                        Integer.parseInt(timeEl.attributeValue("breakTime", "0")));
575                if (timeEl.attributeValue("pattern") != null)
576                    time.setTimePatternId(Long.valueOf(timeEl.attributeValue("pattern")));
577            }
578            List<RoomLocation> room = new ArrayList<RoomLocation>();
579            for (Iterator<?> j = classEl.elementIterator("room"); j.hasNext();) {
580                Element roomEl = (Element) j.next();
581                if (!"true".equals(roomEl.attributeValue("solution", "false"))) continue;
582                room.add(rooms.get(Long.valueOf(roomEl.attributeValue("id"))));
583            }
584            Placement placement = (time == null ? null : new Placement(null, time, room));
585            if (placement != null)
586                timetable.put(classId, placement);
587        }
588        return timetable;
589    }
590    
591    /**
592     * Load travel times
593     * @param travelTimesEl travel-time element
594     * @param metric distance metric to be populated
595     */
596    protected void loadTravelTimes(Element travelTimesEl, DistanceMetric metric) {
597        for (Iterator<?> i = travelTimesEl.elementIterator("travel-time"); i.hasNext();) {
598            Element travelTimeEl = (Element)i.next();
599            metric.addTravelTime(
600                    Long.valueOf(travelTimeEl.attributeValue("id1")),
601                    Long.valueOf(travelTimeEl.attributeValue("id2")),
602                    Integer.valueOf(travelTimeEl.attributeValue("minutes")));
603        }
604    }
605    
606    /**
607     * Load linked sections
608     * @param constraintsEl constraints element
609     * @param offeringTable offering table
610     */
611    protected void loadLinkedSectiond(Element constraintsEl, Map<Long, Offering> offeringTable) {
612        for (Iterator<?> i = constraintsEl.elementIterator("linked-sections"); i.hasNext();) {
613            Element linkedEl = (Element) i.next();
614            List<Section> sections = new ArrayList<Section>();
615            for (Iterator<?> j = linkedEl.elementIterator("section"); j.hasNext();) {
616                Element sectionEl = (Element) j.next();
617                Offering offering = offeringTable.get(Long.valueOf(sectionEl.attributeValue("offering")));
618                sections.add(offering.getSection(Long.valueOf(sectionEl.attributeValue("id"))));
619            }
620            getModel().addLinkedSections(sections);
621        }
622    }
623    
624    /**
625     * Load students
626     * @param studentsEl students element
627     * @param offeringTable offering table
628     * @param courseTable course table
629     */
630    protected void loadStudents(Element studentsEl, Map<Long, Offering> offeringTable, Map<Long, Course> courseTable) {
631        List<Enrollment> bestEnrollments = new ArrayList<Enrollment>();
632        List<Enrollment> currentEnrollments = new ArrayList<Enrollment>();
633        for (Iterator<?> i = studentsEl.elementIterator("student"); i.hasNext();) {
634            Element studentEl = (Element) i.next();
635            Student student = loadStudent(studentEl);
636            if (iStudentFilter != null && !iStudentFilter.accept(student))
637                continue;
638            for (Iterator<?> j = studentEl.elementIterator(); j.hasNext();) {
639                Element requestEl = (Element) j.next();
640                Request request = loadRequest(requestEl, student, offeringTable, courseTable);
641                if (request == null) continue;
642                
643                Element initialEl = requestEl.element("initial");
644                if (iLoadInitial && initialEl != null) {
645                    Enrollment enrollment = loadEnrollment(initialEl, request);
646                    if (enrollment != null)
647                        request.setInitialAssignment(enrollment);
648                }
649                Element currentEl = requestEl.element("current");
650                if (iLoadCurrent && currentEl != null) {
651                    Enrollment enrollment = loadEnrollment(currentEl, request);
652                    if (enrollment != null)
653                        currentEnrollments.add(enrollment);
654                }
655                Element bestEl = requestEl.element("best");
656                if (iLoadBest && bestEl != null) {
657                    Enrollment enrollment = loadEnrollment(bestEl, request);
658                    if (enrollment != null)
659                        bestEnrollments.add(enrollment);
660                }
661            }
662            getModel().addStudent(student);
663        }
664
665        if (!bestEnrollments.isEmpty()) {
666            // Enrollments with a reservation must go first
667            for (Enrollment enrollment : bestEnrollments) {
668                if (enrollment.getReservation() == null) continue;
669                Map<Constraint<Request, Enrollment>, Set<Enrollment>> conflicts = getModel().conflictConstraints(getAssignment(), enrollment);
670                if (conflicts.isEmpty())
671                    getAssignment().assign(0, enrollment);
672                else
673                    sLogger.warn("Enrollment " + enrollment + " conflicts with " + conflicts);
674            }
675            for (Enrollment enrollment : bestEnrollments) {
676                if (enrollment.getReservation() != null) continue;
677                Map<Constraint<Request, Enrollment>, Set<Enrollment>> conflicts = getModel().conflictConstraints(getAssignment(), enrollment);
678                if (conflicts.isEmpty())
679                    getAssignment().assign(0, enrollment);
680                else
681                    sLogger.warn("Enrollment " + enrollment + " conflicts with " + conflicts);
682            }
683            getModel().saveBest(getAssignment());
684        }
685
686        if (!currentEnrollments.isEmpty()) {
687            for (Request request : getModel().variables())
688                getAssignment().unassign(0, request);
689            // Enrollments with a reservation must go first
690            for (Enrollment enrollment : currentEnrollments) {
691                if (enrollment.getReservation() == null) continue;
692                Map<Constraint<Request, Enrollment>, Set<Enrollment>> conflicts = getModel().conflictConstraints(getAssignment(), enrollment);
693                if (conflicts.isEmpty())
694                    getAssignment().assign(0, enrollment);
695                else
696                    sLogger.warn("Enrollment " + enrollment + " conflicts with " + conflicts);
697            }
698            for (Enrollment enrollment : currentEnrollments) {
699                if (enrollment.getReservation() != null) continue;
700                Map<Constraint<Request, Enrollment>, Set<Enrollment>> conflicts = getModel().conflictConstraints(getAssignment(), enrollment);
701                if (conflicts.isEmpty())
702                    getAssignment().assign(0, enrollment);
703                else
704                    sLogger.warn("Enrollment " + enrollment + " conflicts with " + conflicts);
705            }
706        }
707    }
708    
709    /**
710     * Load student
711     * @param studentEl student element
712     * @return loaded student
713     */
714    protected Student loadStudent(Element studentEl) {
715        Student student = new Student(Long.parseLong(studentEl.attributeValue("id")), "true".equals(studentEl.attributeValue("dummy")));
716        student.setExternalId(studentEl.attributeValue("externalId"));
717        student.setName(studentEl.attributeValue("name"));
718        student.setStatus(studentEl.attributeValue("status"));
719        for (Iterator<?> j = studentEl.elementIterator(); j.hasNext();) {
720            Element requestEl = (Element) j.next();
721            if ("classification".equals(requestEl.getName())) {
722                student.getAcademicAreaClasiffications().add(
723                        new AcademicAreaCode(requestEl.attributeValue("area"), requestEl.attributeValue("code")));
724            } else if ("major".equals(requestEl.getName())) {
725                student.getMajors().add(
726                        new AcademicAreaCode(requestEl.attributeValue("area"), requestEl.attributeValue("code")));
727            } else if ("minor".equals(requestEl.getName())) {
728                student.getMinors().add(
729                        new AcademicAreaCode(requestEl.attributeValue("area"), requestEl.attributeValue("code")));
730            }
731        }
732        return student;
733    }
734    
735    /**
736     * Load request
737     * @param requestEl request element
738     * @param student parent student
739     * @param offeringTable offering table
740     * @param courseTable course table
741     * @return loaded request
742     */
743    protected Request loadRequest(Element requestEl, Student student, Map<Long, Offering> offeringTable, Map<Long, Course> courseTable) {
744        if ("freeTime".equals(requestEl.getName())) {
745            return loadFreeTime(requestEl, student);
746        } else if ("course".equals(requestEl.getName())) {
747            return loadCourseRequest(requestEl, student, offeringTable, courseTable);
748        } else {
749            return null;
750        }
751    }
752    
753    /**
754     * Load free time request
755     * @param requestEl request element
756     * @param student parent student
757     * @return loaded free time request
758     */
759    public FreeTimeRequest loadFreeTime(Element requestEl, Student student) {
760        TimeLocation time = new TimeLocation(Integer.parseInt(requestEl.attributeValue("days"), 2),
761                Integer.parseInt(requestEl.attributeValue("start")), Integer.parseInt(requestEl
762                        .attributeValue("length")), 0, 0,
763                requestEl.attributeValue("datePattern") == null ? null : Long.valueOf(requestEl
764                        .attributeValue("datePattern")), "", createBitSet(requestEl
765                        .attributeValue("dates")), 0);
766        FreeTimeRequest request = new FreeTimeRequest(Long.parseLong(requestEl.attributeValue("id")),
767                Integer.parseInt(requestEl.attributeValue("priority")), "true".equals(requestEl
768                        .attributeValue("alternative")), student, time);
769        if (requestEl.attributeValue("weight") != null)
770            request.setWeight(Double.parseDouble(requestEl.attributeValue("weight")));
771        return request;
772    }
773    
774    /**
775     * Load course request
776     * @param requestEl request element
777     * @param student parent student
778     * @param offeringTable offering table
779     * @param courseTable course table
780     * @return loaded course request
781     */
782    public CourseRequest loadCourseRequest(Element requestEl, Student student, Map<Long, Offering> offeringTable, Map<Long, Course> courseTable) {
783        List<Course> courses = new ArrayList<Course>();
784        courses.add(courseTable.get(Long.valueOf(requestEl.attributeValue("course"))));
785        for (Iterator<?> k = requestEl.elementIterator("alternative"); k.hasNext();)
786            courses.add(courseTable.get(Long.valueOf(((Element) k.next()).attributeValue("course"))));
787        Long timeStamp = null;
788        if (requestEl.attributeValue("timeStamp") != null)
789            timeStamp = Long.valueOf(requestEl.attributeValue("timeStamp"));
790        CourseRequest courseRequest = new CourseRequest(
791                Long.parseLong(requestEl.attributeValue("id")),
792                Integer.parseInt(requestEl.attributeValue("priority")),
793                "true".equals(requestEl.attributeValue("alternative")), 
794                student, courses,
795                "true".equals(requestEl.attributeValue("waitlist", "false")), timeStamp);
796        if (requestEl.attributeValue("weight") != null)
797            courseRequest.setWeight(Double.parseDouble(requestEl.attributeValue("weight")));
798        for (Iterator<?> k = requestEl.elementIterator("waitlisted"); k.hasNext();) {
799            Element choiceEl = (Element) k.next();
800            courseRequest.getWaitlistedChoices().add(
801                    new Choice(offeringTable.get(Long.valueOf(choiceEl.attributeValue("offering"))), choiceEl.getText()));
802        }
803        for (Iterator<?> k = requestEl.elementIterator("selected"); k.hasNext();) {
804            Element choiceEl = (Element) k.next();
805            courseRequest.getSelectedChoices().add(
806                    new Choice(offeringTable.get(Long.valueOf(choiceEl.attributeValue("offering"))), choiceEl.getText()));
807        }
808        groups: for (Iterator<?> k = requestEl.elementIterator("group"); k.hasNext();) {
809            Element groupEl = (Element) k.next();
810            long gid = Long.parseLong(groupEl.attributeValue("id"));
811            String gname = groupEl.attributeValue("name", "g" + gid);
812            Course course = courseTable.get(Long.valueOf(groupEl.attributeValue("course")));
813            for (RequestGroup g: course.getRequestGroups()) {
814                if (g.getId() == gid) {
815                    courseRequest.addRequestGroup(g);
816                    continue groups;
817                }
818            }
819            courseRequest.addRequestGroup(new RequestGroup(gid, gname, course));
820        }
821        return courseRequest;
822    }
823    
824    /**
825     * Load enrollment
826     * @param enrollmentEl enrollment element (current, best, or initial)
827     * @param request parent request
828     * @return loaded enrollment
829     */
830    protected Enrollment loadEnrollment(Element enrollmentEl, Request request) {
831        if (request instanceof CourseRequest) {
832            CourseRequest courseRequest = (CourseRequest) request;
833            HashSet<Section> sections = new HashSet<Section>();
834            for (Iterator<?> k = enrollmentEl.elementIterator("section"); k.hasNext();) {
835                Element sectionEl = (Element) k.next();
836                Section section = courseRequest.getSection(Long.parseLong(sectionEl
837                        .attributeValue("id")));
838                sections.add(section);
839            }
840            Reservation reservation = null;
841            if (enrollmentEl.attributeValue("reservation", null) != null) {
842                long reservationId = Long.valueOf(enrollmentEl.attributeValue("reservation"));
843                for (Course course: courseRequest.getCourses())
844                    for (Reservation r: course.getOffering().getReservations())
845                        if (r.getId() == reservationId) { reservation = r; break; }
846            }
847            if (!sections.isEmpty())
848                return courseRequest.createEnrollment(sections, reservation);
849        } else if (request instanceof FreeTimeRequest) {
850            return ((FreeTimeRequest)request).createEnrollment();
851        }
852        return null;
853    }
854
855
856}